Optical imaging lens

ABSTRACT

An optical imaging lens including first, second, third, fourth, fifth and sixth lens elements sequentially along an optical axis from an object side to an image side is provided. The first to sixth lens elements each includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing imaging rays to pass through. The optical imaging lens has only the six lens elements and satisfies condition expressions of Li11t42/L42t62≥2.400 and V3+V4+V5≤120.000.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application no. 202010504465.6, filed on Jun. 5, 2020. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

TECHNICAL FIELD

The invention relates to an optical element, and more particularly, to an optical imaging lens.

BACKGROUND

In recent years, optical imaging lenses have been continuously evolving. In addition to requiring the optical imaging lens to be light, thin, and short, it is also increasingly important to expand a viewing angle of the optical imaging lens, and improve imaging quality of the lens such as aberration and chromatic aberration.

However, in response to demand, if a distance from an object-side surface of a first lens element to an image-side surface on an optical axis increases, it is not conducive to the thinning of mobile phones and digital cameras. Therefore, providing an optical imaging lens that is light, thin, short, and has a large field of view and good imaging quality has always been a design development goal.

SUMMARY

The invention provides an optical imaging lens, which has a larger field of view angle while having a system length shortened for the optical imaging lens and an F-number reduced for the optical imaging lens.

The invention provides an optical imaging lens including first, second, third, fourth, fifth and sixth lens elements sequentially along an optical axis from an object side to an image side. The first to sixth lens elements each includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing imaging rays to pass through. The first lens element has negative refracting power. A periphery region of the image-side surface of the second lens element is convex. An optical axis region of the object-side surface of the third lens element is convex. An optical axis region of the object-side surface of the fourth lens element is convex. An optical axis region of the image-side surface of the fifth lens element is convex. A periphery region of the object-side surface of the sixth lens element is concave and an optical axis region of the image-side surface of the sixth lens element is concave. The optical imaging lens has only the six lens elements and satisfies condition expressions of: Li11t42/L42t62≥2.400 and V3+V4+V5≤120.000, wherein Li11t42 is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, L42t62 is a distance from the image-side surface of the fourth lens element to the image-side surface of the sixth lens element along the optical axis, V3 is an Abbe number of the third lens element, V4 is an Abbe number of the fourth lens element, and V5 is an Abbe number of the fifth lens element.

The invention further provides an optical imaging lens including first, second, third, fourth, fifth and sixth lens elements sequentially along an optical axis from an object side to an image side. The first to sixth lens elements each includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing imaging rays to pass through. The first lens element has negative refracting power, and a periphery region of the object-side surface of the first lens element is convex. An optical axis region of the image-side surface of the second lens element is convex. A periphery region of the image-side surface of the third lens element is concave.

An optical axis region of the image-side surface of the fifth lens element is convex. A periphery region of the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element has an optical axis region being concave and a periphery region being convex. The optical imaging lens has only the six lens elements and satisfies condition expressions of: Li11t42/L42t62≥2.500 and V4+V5≤80.000, wherein Li11t42 is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, L42t62 is a distance from the image-side surface of the fourth lens element to the image-side surface of the sixth lens element along the optical axis, V4 is an Abbe number of the fourth lens element, and V5 is an Abbe number of the fifth lens element.

The invention further provides an optical imaging lens including first, second, third, fourth, fifth and sixth lens elements sequentially along an optical axis from an object side to an image side. The first to sixth lens elements each includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing imaging rays to pass through. The first lens element has negative refracting power, and a periphery region of the object-side surface of the first lens element is convex. The third lens element has negative refracting power and a periphery region of the image-side surface of the third lens element is concave. An optical axis region of the image-side surface of the fifth lens element is convex. A periphery region of the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element has an optical axis region being concave and a periphery region being convex. The optical imaging lens has only the six lens elements and satisfies condition expressions of: Li11t42/L42t62≥2.500 and V4+V5≤80.000, wherein Li11t42 is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, L42t62 is a distance from the image-side surface of the fourth lens element to the image-side surface of the sixth lens element along the optical axis, V4 is an Abbe number of the fourth lens element, and V5 is an Abbe number of the fifth lens element.

In an embodiment of the invention, the first lens element has negative refracting power; a periphery region of the object-side surface of the first lens element is convex; the second lens element has positive refracting power; a periphery region of the image-side surface of the second lens element is convex; a periphery region of the image-side surface of the third lens element is concave; the fifth lens element has negative refracting power; a periphery region of the image-side surface of the fifth lens element is convex; a periphery region of the object-side surface of the sixth lens element is concave; an optical axis region of the image-side surface of the sixth lens element is concave; a periphery region of the image-side surface of the sixth lens element is convex; and the optical imaging lens satisfies V4+V5≤80.000. In addition, the thickest and the second thickest lens elements among all the lens elements (e.g., the first lens element to the sixth lens element) of the optical imaging lens are between the first lens element to the fourth lens element.

In an embodiment of the invention, the first lens element has negative refracting power; a periphery region of the object-side surface of the first lens element is convex; the second lens element has positive refracting power; a periphery region of the image-side surface of the third lens element is concave; the fifth lens element has negative refracting power; an optical axis region of the object-side surface of the fifth lens element is concave, a periphery region of the image-side surface of the fifth lens element is convex; an optical axis region of the image-side surface of the sixth lens element is concave, and the optical imaging lens satisfies V4+V5≤80.000. In addition, the thickest and the second thickest lens elements among all the lens elements (e.g., the first lens element to the sixth lens element) of the optical imaging lens are between the first lens element to the fourth lens element.

Based on the above, the optical imaging lens according to the embodiment of the invention has the following advantageous effects. With the design that satisfies the concave and convex surfaces of the lens elements, the condition of the refracting power, and the design that satisfies the above conditional expressions, the optical imaging lens can have a larger field of view angle, and reduce the area ratio when the optical imaging lens is installed in a capturing device while shortening the length of the optical imaging lens and maintaining good imaging quality.

To make the aforementioned more comprehensible, several embodiments accompanied with drawings are described in detail as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating a surface structure of a lens element.

FIG. 2 is a schematic view illustrating a concave and convex surface structure and a light ray intersection of a lens element.

FIG. 3 is a schematic view illustrating a surface structure of a lens element according to a first example.

FIG. 4 is a schematic view illustrating a surface structure of a lens element according to a second example.

FIG. 5 is a schematic view illustrating a surface structure of a lens element according to a third example.

FIG. 6 is a schematic view illustrating an optical imaging lens according to a first embodiment of the invention.

FIG. 7A to FIG. 7D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the first embodiment of the invention.

FIG. 8 shows detailed optical data of the optical imaging lens according to the first embodiment of the invention.

FIG. 9 shows aspheric parameters of the optical imaging lens according to the first embodiment of the invention.

FIG. 10 is a schematic view illustrating an optical imaging lens according to a second embodiment of the invention.

FIG. 11A to FIG. 11D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the second embodiment of the invention.

FIG. 12 shows detailed optical data of the optical imaging lens according to the second embodiment of the invention.

FIG. 13 shows aspheric parameters of the optical imaging lens according to the second embodiment of the invention.

FIG. 14 is a schematic view illustrating an optical imaging lens according to a third embodiment of the invention.

FIG. 15A to FIG. 15D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the third embodiment of the invention.

FIG. 16 shows detailed optical data of the optical imaging lens according to the third embodiment of the invention.

FIG. 17 shows aspheric parameters of the optical imaging lens according to the third embodiment of the invention.

FIG. 18 is a schematic view illustrating an optical imaging lens according to a fourth embodiment of the invention.

FIG. 19A to FIG. 19D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fourth embodiment of the invention.

FIG. 20 shows detailed optical data of the optical imaging lens according to the fourth embodiment of the invention.

FIG. 21 shows aspheric parameters of the optical imaging lens according to the fourth embodiment of the invention.

FIG. 22 is a schematic view illustrating an optical imaging lens according to a fifth embodiment of the invention.

FIG. 23A to FIG. 23D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fifth embodiment of the invention.

FIG. 24 shows detailed optical data of the optical imaging lens according to the fifth embodiment of the invention.

FIG. 25 shows aspheric parameters of the optical imaging lens according to the fifth embodiment of the invention.

FIG. 26 is a schematic view illustrating an optical imaging lens according to a sixth embodiment of the invention.

FIG. 27A to FIG. 27D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the sixth embodiment of the invention.

FIG. 28 shows detailed optical data of the optical imaging lens according to the sixth embodiment of the invention.

FIG. 29 shows aspheric parameters of the optical imaging lens according to the sixth embodiment of the invention.

FIG. 30 is a schematic view illustrating an optical imaging lens according to a seventh embodiment of the invention.

FIG. 31A to FIG. 31D are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the seventh embodiment.

FIG. 32 shows detailed optical data of the optical imaging lens according to the seventh embodiment of the invention.

FIG. 33 shows aspheric parameters of the optical imaging lens according to the seventh embodiment of the invention.

FIG. 34 is a schematic view illustrating an optical imaging lens according to an eighth embodiment of the invention.

FIG. 35A to FIG. 35D are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the eighth embodiment.

FIG. 36 shows detailed optical data of the optical imaging lens according to the eighth embodiment of the invention.

FIG. 37 shows aspheric parameters of the optical imaging lens according to the eighth embodiment of the invention.

FIG. 38 is a schematic view illustrating an optical imaging lens according to a ninth embodiment of the invention.

FIG. 39A to FIG. 39D are diagrams illustrating a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the ninth embodiment.

FIG. 40 shows detailed optical data of the optical imaging lens according to the ninth embodiment of the invention.

FIG. 41 shows aspheric parameters of the optical imaging lens according to the ninth embodiment of the invention.

FIG. 42 and FIG. 43 show important parameters and values in related relational expressions of the optical lens assembly according to the first to the fifth embodiments of the invention.

FIG. 44 and FIG. 45 show important parameters and values in related relational expressions of the optical lens assembly according to the sixth to the ninth embodiments of the invention.

DETAILED DESCRIPTION

The terms “optical axis region”, “periphery region”, “concave”, and “convex” used in this specification and claims should be interpreted based on the definition listed in the specification by the principle of lexicographer.

In the present disclosure, the optical system may comprise at least one lens element to receive imaging rays that are incident on the optical system over a set of angles ranging from parallel to an optical axis to a half field of view (HFOV) angle with respect to the optical axis. The imaging rays pass through the optical system to produce an image on an image plane. The term “a lens element having positive refracting power (or negative refracting power)” means that the paraxial refracting power of the lens element in Gaussian optics is positive (or negative). The term “an object-side (or image-side) surface of a lens element” refers to a specific region of that surface of the lens element at which imaging rays can pass through that specific region. Imaging rays include at least two types of rays: a chief ray Lc and a marginal ray Lm (as shown in FIG. 1 ). An object-side (or image-side) surface of a lens element can be characterized as having several regions, including an optical axis region, a periphery region, and, in some cases, one or more intermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Two referential points for the surfaces of the lens element 100 can be defined: a central point, and a transition point. The central point of a surface of a lens element is a point of intersection of that surface and the optical axis I. As illustrated in FIG. 1 , a first central point CP1 may be present on the object-side surface 110 of lens element 100 and a second central point CP2 may be present on the image-side surface 120 of the lens element 100. The transition point is a point on a surface of a lens element, at which the line tangent to that point is perpendicular to the optical axis I. The optical boundary OB of a surface of the lens element is defined as a point at which the radially outermost marginal ray Lm passing through the surface of the lens element intersects the surface of the lens element. All transition points lie between the optical axis I and the optical boundary OB of the surface of the lens element. If multiple transition points are present on a single surface, then these transition points are sequentially named along the radial direction of the surface with reference numerals starting from the first transition point. For example, the first transition point, e.g., TP1, (closest to the optical axis I), the second transition point, e.g., TP2, (as shown in FIG. 4 ), and the Nth transition point (farthest from the optical axis I).

The region of a surface of the lens element from the central point to the first transition point TP1 is defined as the optical axis region, which includes the central point. The region located radially outside of the farthest Nth transition point from the optical axis I to the optical boundary OB of the surface of the lens element is defined as the periphery region. In some embodiments, there may be intermediate regions present between the optical axis region and the periphery region, with the number of intermediate regions depending on the number of the transition points.

The shape of a region is convex if a collimated ray being parallel to the optical axis I and passing through the region is bent toward the optical axis I such that the ray intersects the optical axis I on the image side A2 of the lens element. The shape of a region is concave if the extension line of a collimated ray being parallel to the optical axis I and passing through the region intersects the optical axis I on the object side A1 of the lens element.

Additionally, referring to FIG. 1 , the lens element 100 may also have a mounting portion 130 extending radially outward from the optical boundary OB. The mounting portion 130 is typically used to physically secure the lens element to a corresponding element of the optical system (not shown). Imaging rays do not reach the mounting portion 130. The structure and shape of the mounting portion 130 are only examples to explain the technologies, and should not be taken as limiting the scope of the present disclosure. The mounting portion 130 of the lens elements discussed below may be partially or completely omitted in the following drawings.

Referring to FIG. 2 , optical axis region Z1 is defined between central point CP and first transition point TP1. Periphery region Z2 is defined between TP1 and the optical boundary OB of the surface of the lens element. Collimated ray 211 intersects the optical axis I on the image side A2 of lens element 200 after passing through optical axis region Z1, i.e., the focal point of collimated ray 211 after passing through optical axis region Z1 is on the image side A2 of the lens element 200 at point R in FIG. 2 . Accordingly, since the ray itself intersects the optical axis I on the image side A2 of the lens element 200, optical axis region Z1 is convex. On the contrary, collimated ray 212 diverges after passing through periphery region Z2. The extension line EL of collimated ray 212 after passing through periphery region Z2 intersects the optical axis I on the object side A1 of lens element 200, i.e., the focal point of collimated ray 212 after passing through periphery region Z2 is on the object side A1 at point M in FIG. 2 . Accordingly, since the extension line EL of the ray intersects the optical axis I on the object side A1 of the lens element 200, periphery region Z2 is concave. In the lens element 200 illustrated in FIG. 2 , the first transition point TP1 is the border of the optical axis region and the periphery region, i.e., TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skill in the art to determine whether an optical axis region is convex or concave by referring to the sign of “Radius” (the “R” value), which is the paraxial radius of shape of a lens surface in the optical axis region. The R value is commonly used in conventional optical design software such as Zemax and CodeV. The R value usually appears in the lens data sheet in the software. For an object-side surface, a positive R value defines that the optical axis region of the object-side surface is convex, and a negative R value defines that the optical axis region of the object-side surface is concave. Conversely, for an image-side surface, a positive R value defines that the optical axis region of the image-side surface is concave, and a negative R value defines that the optical axis region of the image-side surface is convex. The result found by using this method should be consistent with the method utilizing intersection of the optical axis by rays/extension lines mentioned above, which determines surface shape by referring to whether the focal point of a collimated ray being parallel to the optical axis I is on the object-side or the image-side of a lens element. As used herein, the terms “a shape of a region is convex (concave),” “a region is convex (concave),” and “a convex- (concave-) region,” can be used alternatively.

FIG. 3 , FIG. 4 and FIG. 5 illustrate examples of determining the shape of lens element regions and the boundaries of regions under various circumstances, including the optical axis region, the periphery region, and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. As illustrated in FIG. 3 , only one transition point TP1 appears within the optical boundary OB of the image-side surface 320 of the lens element 300. Optical axis region Z1 and periphery region Z2 of the image-side surface 320 of lens element 300 are illustrated. The R value of the image-side surface 320 is positive (i.e., R>0). Accordingly, the optical axis region Z1 is concave.

In general, the shape of each region demarcated by the transition point will have an opposite shape to the shape of the adjacent region(s). Accordingly, the transition point will define a transition in shape, changing from concave to convex at the transition point or changing from convex to concave. In FIG. 3 , since the shape of the optical axis region Z1 is concave, the shape of the periphery region Z2 will be convex as the shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referring to FIG. 4 , a first transition point TP1 and a second transition point TP2 are present on the object-side surface 410 of lens element 400. The optical axis region Z1 of the object-side surface 410 is defined between the optical axis I and the first transition point TP1. The R value of the object-side surface 410 is positive (i.e., R>0). Accordingly, the optical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is also convex, is defined between the second transition point TP2 and the optical boundary OB of the object-side surface 410 of the lens element 400. Further, intermediate region Z3 of the object-side surface 410, which is concave, is defined between the first transition point TP1 and the second transition point TP2. Referring once again to FIG. 4 , the object-side surface 410 includes an optical axis region Z1 located between the optical axis I and the first transition point TP1, an intermediate region Z3 located between the first transition point TP1 and the second transition point TP2, and a periphery region Z2 located between the second transition point TP2 and the optical boundary OB of the object-side surface 410. Since the shape of the optical axis region Z1 is designed to be convex, the shape of the intermediate region Z3 is concave as the shape of the intermediate region Z3 changes at the first transition point TP1, and the shape of the periphery region Z2 is convex as the shape of the periphery region Z2 changes at the second transition point TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lens element 500 has no transition point on the object-side surface 510 of the lens element 500. For a surface of a lens element with no transition point, for example, the object-side surface 510 the lens element 500, the optical axis region Z1 is defined as the region between 0-50% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element and the periphery region is defined as the region between 50%-100% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element. Referring to lens element 500 illustrated in FIG. 5 , the optical axis region Z1 of the object-side surface 510 is defined between the optical axis I and 50% of the distance between the optical axis I and the optical boundary OB. The R value of the object-side surface 510 is positive (i.e., R>0). Accordingly, the optical axis region Z1 is convex. For the object-side surface 510 of the lens element 500, because there is no transition point, the periphery region Z2 of the object-side surface 510 is also convex. It should be noted that lens element 500 may have a mounting portion (not shown) extending radially outward from the periphery region Z2.

FIG. 6 is a schematic view illustrating an optical imaging lens according to a first embodiment of the invention. FIG. 7A to FIG. 7D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the first embodiment of the invention. Referring to FIG. 6 , an optical imaging lens 10 in the first embodiment of the invention includes a first lens element 1, an aperture stop 0, a second lens element 2, a third lens element 3, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6 and a filter 9 sequentially along the optical axis I of the optical imaging lens 10 from the object side A1 to the image side A2. After entering the optical imaging lens 10 and passing through the first lens element 1, the aperture stop 0, the second lens element 2, the third lens element 3, the fourth lens element 4, the fifth lens element 5, the sixth lens element 6 and the filter 9, an imaging ray emitted by a to-be-photographed object forms an image on an image plane 99. The filter 9 is disposed between an image-side surface 66 of the sixth lens element 6 and the image plane 99. It should be noted that, the object side A1 is one side that faces toward the to-be-photographed object, and the image side A2 is one side that faces toward the image plane 99. In this embodiment, the filter 9 may be an IR Cut Filter.

In this embodiment, the first lens element 1, the second lens element 2, the third lens element 3, the fourth lens element 4, the fifth lens element 5, the sixth lens element 6 and the filter 9 of the optical imaging lens 10 respectively include object-side surfaces 15, 25, 35, 45, 55, 65 and 95 facing toward the object side A1 and allowing the imaging rays to pass through and image-side surfaces 16, 26, 36, 46, 56, 66 and 96 facing toward the image side A2 and allowing the imaging rays to pass through. In this embodiment, the aperture stop 0 is disposed between the first lens element 1 and the second lens element 2.

The first lens element 1 has negative refracting power. The first lens element 1 is made of plastic material. An optical axis region 151 of the object-side surface 15 of the first lens element 1 is convex, and a periphery region 153 thereof is convex. An optical axis region 161 of the image-side surface 16 of the first lens element 1 is concave, and a periphery region 163 thereof is concave. In this embodiment, each of the object-side surface 15 and the image-side surface 16 of the first lens element 1 is an aspheric surface, but the invention is not limited thereto.

The second lens element 2 has positive refracting power. The second lens element 2 is made of plastic material. An optical axis region 251 of the object-side surface 25 of the second lens element 2 is convex, and a periphery region 253 thereof is convex. An optical axis region 261 of the image-side surface 26 of the second lens element 2 is convex, and a periphery region 263 thereof is convex. In this embodiment, each of the object-side surface 25 and the image-side surface 26 of the second lens element 2 is an aspheric surface, but the invention is not limited thereto.

The third lens element 3 has negative refracting power. The third lens element 3 is made of plastic material. An optical axis region 351 of the object-side surface 35 of the third lens element 3 is convex, and a periphery region 353 thereof is concave. An optical axis region 361 of the image-side surface 36 of the third lens element 3 is concave, and a periphery region 363 thereof is concave. In this embodiment, each of the object-side surface 35 and the image-side surface 36 of the third lens element 3 is an aspheric surface, but the invention is not limited thereto.

The fourth lens element 4 has positive refracting power. The fourth lens element 4 is made of plastic material. An optical axis region 451 of the object-side surface 45 of the fourth lens element 4 is convex, and a periphery region 453 thereof is convex. An optical axis region 461 of the image-side surface 46 of the fourth lens element 4 is convex, and a periphery region 463 thereof is convex. In this embodiment, each of the object-side surface 45 and the image-side surface 46 of the fourth lens element 4 is an aspheric surface, but the invention is not limited thereto.

The fifth lens element 5 has negative refracting power. The fifth lens element 5 is made of plastic material. An optical axis region 551 of the object-side surface 55 of the fifth lens element 5 is concave, and a periphery region 553 thereof is concave. An optical axis region 561 of the image-side surface 56 of the fifth lens element 5 is convex, and a periphery region 563 thereof is convex. In this embodiment, each of the object-side surface 55 and the image-side surface 56 of the fifth lens element 5 is an aspheric surface, but the invention is not limited thereto.

The sixth lens element 6 has negative refracting power. The sixth lens element 6 is made of plastic material. An optical axis region 651 of the object-side surface 65 of the sixth lens element 6 is convex, and a periphery region 653 thereof is concave. An optical axis region 661 of the image-side surface 66 of the sixth lens element 6 is concave, and a periphery region 663 thereof is convex. In this embodiment, each of the object-side surface 65 and the image-side surface 66 of the sixth lens element 6 is an aspheric surface, but the invention is not limited thereto.

In the present embodiment, the optical imaging lens 10 has only the six lens elements described above.

Other detailed optical data of the first embodiment are shown in FIG. 8 . In the optical imaging lens 10 of the first embodiment, an effective focal length (EFL) is 1.931 mm (millimeter); a half field of view (HFOV) is 44.300 degrees; a system length is 4.070 mm; an F-number (Fno) is 2.000; and an image height is 1.810 mm. Here, the system length refers to a distance from the object-side surface 15 of the first lens element 1 to the image plane 99 along the optical axis I.

Further, in the present embodiment, all of the object-side surfaces 15, 25, 35, 45, 55 and 65 and the image-side surfaces 16, 26, 36, 46, 56, and 66 of the first lens element 1, the second lens element 2 the third lens element 3, the fourth lens element 4, the fifth lens element 5 and the sixth lens element 6 (12 surfaces in total) are aspheric surfaces. The object-side surfaces 15, 25, 35, 45, 55 and 65 and the image-side surfaces 16, 26, 36, 46, 56 and 66 are common even asphere surfaces. These aspheric surfaces are defined by Equation (1) below.

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum_{i = 1}^{n}{a_{i} \times Y^{i}}}}$

Therein,

Y: a distance from a point on an aspheric curve to the optical axis I;

Z: a depth of the aspheric surface (a perpendicular distance between the point on the aspheric surface that is spaced from the optical axis I by the distance Y and a tangent plane tangent to a vertex of the aspheric surface on the optical axis I);

R: a radius of curvature of the surface of the lens element close to the optical axis I;

K: a conic constant;

a_(i): an i^(th) aspheric coefficient.

The aspheric coefficients of the object-side surface 15 of the first lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) are shown in FIG. 9 . In FIG. 9 , a field marked by “15” indicates that the respective row includes the aspheric coefficients of the object-side surface 15 of the first lens element 1, and the same applies to the rest of fields. In this embodiment and the following embodiments, a 2^(nd) aspheric coefficient a₂ each of the aspheric surfaces is 0 and therefore not listed in FIG. 9 .

In addition, the relationship between the important parameters in the optical imaging lens 10 of the first embodiment is shown in FIGS. 42 and 43 .

Therein,

T1 is a thickness of the first lens element 1 along the optical axis I;

T2 is a thickness of the second lens element 2 along the optical axis I;

T3 is a thickness of the third lens element 3 along the optical axis I;

T4 is a thickness of the fourth lens element 4 along the optical axis I;

T5 is a thickness of the fifth lens element 5 along the optical axis I;

T6 is a thickness of the sixth lens element 6 along the optical axis I;

G12 is an air gap from the first lens element 1 to the second lens element 2 along the optical axis I;

G23 is an air gap from the second lens element 2 to the third lens element 3 along the optical axis I;

G34 is an air gap from the third lens element 3 to the fourth lens element 4 along the optical axis I;

G45 is an air gap from the fourth lens element 4 to the fifth lens element 5 along the optical axis I;

G56 is an air gap from the fifth lens element 5 to the sixth lens element 6 along the optical axis I;

G6F is an air gap from the sixth lens element 6 to the filter 9 along the optical axis I;

TF is a thickness of the filter 9 along the optical axis I;

GFP is an air gap from the filter 9 to the image plane 99 along the optical axis I;

AAG is a sum of the five air gaps of the first lens element 1 to the sixth lens element 6 along the optical axis I, i.e., a sum of G12, G23, G34, G45 and G56;

ALT is a sum of the six lens thicknesses of the first lens element 1 to the sixth lens element 6 along the optical axis I, i.e., a sum of T1, T2, T3, T4, T5 and T6;

TL is a distance from the object-side surface 15 of the first lens element 1 to the image-side surface 66 of the sixth lens element 6 along the optical axis I;

TTL is a distance from the object-side surface 15 of the first lens element 1 to the image plane 99 along the optical axis I;

BFL is a distance from the image-side surface 66 of the sixth lens element 6 to the image plane 99 along the optical axis I, i.e., a sum of G6F, TF and GFP;

HFOV is the half field of view of the optical imaging lens 10;

ImgH is an image height of the optical imaging lens 10;

EFL is an effective focal length of the optical imaging lens 10;

Besides, it is further defined that:

Li11t42 is a distance from the object-side surface 15 of the first lens element 1 to the image-side surface 46 of the fourth lens element 4 along the optical axis I;

L42t62 is a distance from the image-side surface 46 of the fourth lens element 4 to the image-side surface 66 of the sixth lens element 6 along the optical axis I;

Tmax is a thickest lens thickness of the first lens element to the sixth lens element along the optical axis, i.e., the largest value of T1, T2, T3, T4, T5 and T6;

Tmax2 is a second thickest lens thickness of the first lens element to the sixth lens element along the optical axis, i.e., the second largest value of T1, T2, T3, T4, T5 and T6;

f1 is a focal length of the first lens element 1;

f2 is a focal length of the second lens element 2;

f3 is a focal length of the third lens element 3;

f4 is a focal length of the fourth lens element 4;

f5 is a focal length of the fifth lens element 5;

f6 is a focal length of the sixth lens element 6;

n1 is a refractive index of the first lens element 1;

n2 is a refractive index of the second lens element 2;

n3 is a refractive index of the third lens element 3;

n4 is a refractive index of the fourth lens element 4;

n5 is a refractive index of the fifth lens element 5;

n6 is a refractive index of the sixth lens element 6;

V1 is an Abbe number of the first lens element 1;

V2 is an Abbe number of the second lens element 2;

V3 is an Abbe number of the third lens element 3;

V4 is an Abbe number of the fourth lens element 4;

V5 is an Abbe number of the fifth lens element 5;

V6 is an Abbe number of the sixth lens element 6.

With reference to FIG. 7A and FIG. 7D, the diagram of FIG. 7A illustrates the longitudinal spherical aberration on the image plane 99 when wavelengths are 486 nm, 588 nm and 656 nm in the first embodiment; the diagrams of FIG. 7B and FIG. 7C respectively illustrate the field curvature aberration in sagittal direction and the field curvature aberration in tangential direction on the image plane 99 when wavelengths are 486 nm, 588 nm and 656 nm in the first embodiment; the diagram of FIG. 7D illustrates the distortion aberration on the image plane 99 when the wavelengths are 486 nm, 588 nm and 656 nm in the first embodiment. The longitudinal spherical aberration in the first embodiment is shown in FIG. 7A, in which the curve of each wavelength is close to one another and approaches the center position, which indicates that the off-axis ray of each wavelength at different heights is concentrated around the imaging point. The skew margin of the curve of each wavelength represents that the imaging point deviation of the off-axis rays at different heights is controlled within a range of ±0.018 mm. Therefore, it is evident that the first embodiment can significantly improve spherical aberration of the same wavelength. In addition, the curves of the three representative wavelengths are close to one another, which represents that the imaging positions of the rays with different wavelengths are concentrated. Therefore, the chromatic aberration can also be significantly improved.

In the two diagrams of the field curvature aberrations as illustrated in FIG. 7B and FIG. 7C, the three representative wavelengths have the focal length variation within ±0.03 mm in the entire field of view, which indicates that aberration of the optical system provided by the first embodiment can be effectively eliminated. In FIG. 7D, the diagram of distortion aberration shows that the distortion aberration in the first embodiment is maintained within the range of ±5%, which indicates that the distortion aberration in the first embodiment can comply with the imaging quality required by the optical system. Accordingly, compared to the existing optical lenses, with the system length shortened to 4.070 mm, the first embodiment can still provide a favorable imaging quality. Therefore, the first embodiment can shorten the lens length and provide a good imaging quality while maintaining favorable optical properties.

FIG. 10 is a schematic view illustrating an optical imaging lens according to a second embodiment of the invention. FIG. 11A to FIG. 11D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the second embodiment of the invention. With reference to FIG. 10 , the second embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 10 .

Detailed optical data of the optical imaging lens 10 of the second embodiment are shown in FIG. 12 . In the optical imaging lens 10 of the second embodiment, an effective focal length (EFL) is 1.949 millimeter (mm); a half field of view (HFOV) is 39.600 degrees; a system length is 3.592 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 13 , FIG. 13 includes the aspheric coefficients of the object-side surface 15 of the first lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the second embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the second embodiment is shown in FIGS. 42 and 43 .

The longitudinal spherical aberration of the second embodiment is shown in FIG. 11A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.009 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 11B and FIG. 11C, the three representative wavelengths have the focal length variation within ±0.03 mm in the entire field of view. In FIG. 11D, the diagram of distortion aberration shows that the distortion aberration in the second embodiment is maintained within the range of ±12%.

In view of the above description, it can be known that the system length of the second embodiment is shorter than the system length of the first embodiment. Therefore, compared with the first embodiment, the second embodiment has a smaller volume. In addition, the longitudinal spherical aberration of the second embodiment is less than the longitudinal spherical aberration of the first embodiment.

FIG. 14 is a schematic view illustrating an optical imaging lens according to a third embodiment of the invention. FIG. 15A to FIG. 15D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the third embodiment of the invention. With reference to FIG. 14 , the third embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 14 .

Detailed optical data of the optical imaging lens 10 of the third embodiment are shown in FIG. 16 . In the optical imaging lens 10 of the third embodiment, an effective focal length (EFL) is 2.097 millimeter (mm); a half field of view (HFOV) is 43.447 degrees; a system length is 4.573 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 17 , FIG. 17 includes the aspheric coefficients of the object-side surface 15 of the first lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the third embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the third embodiment is shown in FIGS. 42 and 43 .

The longitudinal spherical aberration of the third embodiment is shown in FIG. 15A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.018 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 15B and FIG. 15C, the three representative wavelengths have the focal length variation within ±0.03 mm in the entire field of view. In FIG. 15D, the diagram of distortion aberration shows that the distortion aberration in the third embodiment is maintained within the range of ±10%.

In view of the above description, it can be known that the third embodiment is easier to manufacture and therefore has higher yield rate.

FIG. 18 is a schematic view illustrating an optical imaging lens according to a fourth embodiment of the invention. FIG. 19A to FIG. 19D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fourth embodiment of the invention. With reference to FIG. 18 , the fourth embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 18 .

Detailed optical data of the optical imaging lens 10 of the fourth embodiment are shown in FIG. 20 . In the optical imaging lens 10 of the fourth embodiment, an effective focal length (EFL) is 1.830 millimeter (mm); a half field of view (HFOV) is 47.752 degrees; a system length is 3.756 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 21 , FIG. 21 includes the aspheric coefficients of the object-side surface 15 of the first lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the fourth embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the fourth embodiment is shown in FIGS. 42 and 43 .

The longitudinal spherical aberration of the fourth embodiment is shown in FIG. 19A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.012 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 19B and FIG. 19C, the three representative wavelengths have the focal length variation within ±0.016 mm in the entire field of view. In FIG. 19D, the diagram of distortion aberration shows that the distortion aberration in the fourth embodiment is maintained within the range of ±12%.

In view of the above description, it can be known that the system length of the fourth embodiment is shorter than the system length of the first embodiment, and the half field of view of the fourth embodiment is greater than the half field of view of the first embodiment. Therefore, compared with the first embodiment, the fourth embodiment has a smaller volume and a larger angular range for receiving images. In addition, the longitudinal spherical aberration of the fourth embodiment is less than the longitudinal spherical aberration of the first embodiment, and the field curvature aberration of the fourth embodiment is less than the field curvature aberration of the first embodiment.

FIG. 22 is a schematic view illustrating an optical imaging lens according to a fifth embodiment of the invention. FIG. 23A to FIG. 23D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fifth embodiment of the invention. With reference to FIG. 22 , the fifth embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. In addition, in this embodiment, the periphery region 353 of the object-side surface 35 of the third lens element 3 is convex, and the sixth lens element 6 has positive refracting power. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 22 .

Detailed optical data of the optical imaging lens 10 of the fifth embodiment are shown in FIG. 24 . In the optical imaging lens 10 of the fifth embodiment, an effective focal length (EFL) is 1.871 millimeter (mm); a half field of view (HFOV) is 39.600 degrees; a system length is 4.056 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 25 , FIG. 25 includes the aspheric coefficients of the object-side surface 15 of the fifth lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the fifth embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the fifth embodiment is shown in FIGS. 42 and 43 .

The longitudinal spherical aberration of the fifth embodiment is shown in FIG. 23A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.008 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 23B and FIG. 23C, the three representative wavelengths have the focal length variation within ±0.012 mm in the entire field of view. In FIG. 23D, the diagram of distortion aberration shows that the distortion aberration in the fifth embodiment is maintained within the range of ±25%.

In view of the above description, it can be known that the system length of the fifth embodiment is shorter than the system length of the first embodiment. Therefore, compared with the first embodiment, the fifth embodiment has a smaller volume. In addition, the longitudinal spherical aberration of the fifth embodiment is less than the longitudinal spherical aberration of the first embodiment, and the field curvature aberration of the fifth embodiment is less than the field curvature aberration of the first embodiment.

FIG. 26 is a schematic view illustrating an optical imaging lens according to a sixth embodiment of the invention. FIG. 27A to FIG. 27D illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the sixth embodiment of the invention. With reference to FIG. 26 , the sixth embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. In addition, in this embodiment, the optical axis region 251 of the object-side surface 25 of the second lens element 2 is concave; the periphery region 353 of the object-side surface 35 of the third lens element 3 is convex; and the sixth lens element 6 has positive refracting power. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 26 .

Detailed optical data of the optical imaging lens 10 of the sixth embodiment are shown in FIG. 28 . In the optical imaging lens 10 of the sixth embodiment, an effective focal length (EFL) is 1.657 millimeter (mm); a half field of view (HFOV) is 42.672 degrees; a system length is 4.492 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 29 , FIG. 29 includes the aspheric coefficients of the object-side surface 15 of the fifth lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the sixth embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the sixth embodiment is shown in FIGS. 44 and 45 .

The longitudinal spherical aberration of the sixth embodiment is shown in FIG. 27A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.014 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 27B and FIG. 27C, the three representative wavelengths have the focal length variation within ±0.02 mm in the entire field of view. In FIG. 27D, the diagram of distortion aberration shows that the distortion aberration in the fifth embodiment is maintained within the range of ±25%.

In view of the above description, it can be known that the longitudinal spherical aberration of the sixth embodiment is less than the longitudinal spherical aberration of the first embodiment, and the field curvature aberration of the sixth embodiment is less than the field curvature aberration of the first embodiment.

FIG. 30 is a schematic view illustrating an optical imaging lens according to a seventh embodiment of the invention. FIG. 31A to FIG. 31D are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the seventh embodiment. With reference to FIG. 30 , the seventh embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 30 .

Detailed optical data of the optical imaging lens 10 of the seventh embodiment are shown in FIG. 32 . In the optical imaging lens 10 of the seventh embodiment, an effective focal length (EFL) is 2.066 millimeter (mm); a half field of view (HFOV) is 45.176 degrees; a system length is 4.755 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 33 , FIG. 33 includes the aspheric coefficients of the object-side surface 15 of the fifth lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the seventh embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the seventh embodiment is shown in FIGS. 44 and 45 .

The longitudinal spherical aberration of the seventh embodiment is shown in FIG. 31A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.035 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 31B and FIG. 31C, the three representative wavelengths have the focal length variation within ±0.03 mm in the entire field of view. In FIG. 31D, the diagram of distortion aberration shows that the distortion aberration in the fifth embodiment is maintained within the range of ±16%.

In view of the above description, it can be known that the half field of view of the seventh embodiment is greater than the half field of view of the first embodiment. Therefore, compared with the first embodiment, the seventh embodiment has a larger angular range for receiving images.

FIG. 34 is a schematic view illustrating an optical imaging lens according to an eighth embodiment of the invention. FIG. 35A to FIG. 35D are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the eighth embodiment. With reference to FIG. 34 , the eighth embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. In addition, in this embodiment, the periphery region 353 of the object-side surface 35 of the third lens element 3 is convex, and the sixth lens element 6 has positive refracting power. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 34 .

Detailed optical data of the optical imaging lens 10 of the eighth embodiment are shown in FIG. 36 . In the optical imaging lens 10 of the eighth embodiment, an effective focal length (EFL) is 1.488 millimeter (mm); a half field of view (HFOV) is 45.804 degrees; a system length is 4.821 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 37 , FIG. 37 includes the aspheric coefficients of the object-side surface 15 of the fifth lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the eighth embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the eighth embodiment is shown in FIGS. 44 and 45 .

The longitudinal spherical aberration of the eighth embodiment is shown in FIG. 35A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.016 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 35B and FIG. 35C, the three representative wavelengths have the focal length variation within ±0.035 mm in the entire field of view. In FIG. 35D, the diagram of distortion aberration shows that the distortion aberration in the fifth embodiment is maintained within the range of ±25%.

In view of the above description, it can be known that the half field of view of the eighth embodiment is greater than the half field of view of the first embodiment. Therefore, compared with the first embodiment, the eighth embodiment has a larger angular range for receiving images. In addition, the longitudinal spherical aberration of the eighth embodiment is less than the longitudinal spherical aberration of the first embodiment.

FIG. 38 is a schematic view illustrating an optical imaging lens according to a ninth embodiment of the invention. FIG. 39A to FIG. 39D are diagrams illustrating a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the ninth embodiment. With reference to FIG. 38 , the ninth embodiment of the optical imaging lens 10 is substantially similar to the first embodiment, and the difference between the two is that, the optical data, the aspheric coefficients, and the parameters of the lens elements 1, 2, 3, 4, 5 and 6 in these embodiments are different to some extent. In addition, in this embodiment, the fifth lens element 5 has positive refracting power. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in FIG. 38 .

Detailed optical data of the optical imaging lens 10 of the ninth embodiment are shown in FIG. 40 . In the optical imaging lens 10 of the ninth embodiment, an effective focal length (EFL) is 1.650 millimeter (mm); a half field of view (HFOV) is 39.602 degrees; a system length is 3.444 mm; an F-number (Fno) is 2.200; and an image height is 1.810 mm.

As shown in FIG. 41 , FIG. 41 includes the aspheric coefficients of the object-side surface 15 of the fifth lens element 1 to the image-side surface 66 of the sixth lens element 6 in Equation (1) according to the ninth embodiment.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the ninth embodiment is shown in FIGS. 44 and 45 .

The longitudinal spherical aberration of the ninth embodiment is shown in FIG. 39A, in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.3 mm. In the two diagrams of the field curvature aberrations as illustrated FIG. 39B and FIG. 39C, the three representative wavelengths have the focal length variation within ±0.3 mm in the entire field of view. In FIG. 39D, the diagram of distortion aberration shows that the distortion aberration in the fifth embodiment is maintained within the range of ±25%.

In view of the above description, it can be known that the system length of the ninth embodiment is shorter than the system length of the first embodiment. Therefore, compared with the first embodiment, the ninth embodiment has a smaller volume.

With reference to FIG. 42 to FIG. 45 , FIG. 42 to FIG. 45 are table diagrams showing the optical parameters provided in the first embodiment to the ninth embodiment. When the half field of view of the optical imaging lens 10 satisfies the following proportional relationship, the purpose of expanding the field of view can be achieved.

Here,

the optical imaging lens 10 may satisfy HFOV/Fno≥218.000 degrees, wherein a more preferable range is 18.000 degrees≥HFOV/Fno≤23.900 degrees;

the optical imaging lens 10 may satisfy HFOV/(Tmax+Tmax2)≥20.000 degrees/mm, wherein a more preferable range is 20.000 degrees/mm≤HFOV/(Tmax+Tmax2)≤43.300 degrees/mm; and

the optical imaging lens 10 may satisfy HFOV/TTL≥29.500 degrees/mm, wherein a more preferable range is 9.500 degrees/mm HFOV/TTL≤14.000 degrees/mm.

In addition, as measures for achieving the shortened system length for the lens elements and ensuring the imaging quality while taking the ease of production into account, the air gaps of the lens elements may be shortened or the thicknesses of the lens elements may be properly shortened. If the numerical limitations in the following condition expressions can be satisfied, a more preferable configuration of the embodiments of the invention may be accomplished.

Here,

the optical imaging lens 10 may satisfy (EFL+BFL)/ALT≥20.800, wherein a more preferable range is 0.800≤(EFL+BFL)/ALT≤1.300;

the optical imaging lens 10 may satisfy ALT/AAG≤3.000, wherein a more preferable range is 3.000≤ALT/AAG≤5.700;

the optical imaging lens 10 may satisfy TL/(G12+G23+G34)≥5.100, wherein a more preferable range is 5.100≤TL/(G12+G23+G34)≤9.100;

the optical imaging lens 10 may satisfy TTL/(Tmax+Tmax2)≤3.100, wherein a more preferable range is 1.900≤TTL/(Tmax+Tmax2)≤3.100;

the optical imaging lens 10 may satisfy (G34+T4+G45)/BFL≥1.000, wherein a more preferable range is 1.000≤(G34+T4+G45)/BFL≤1.800;

the optical imaging lens 10 may satisfy (EFL+BFL)/AAG≥2.400, wherein a more preferable range is 2.400≤(EFL+BFL)/AAG≤4.900;

the optical imaging lens 10 may satisfy ALT/(G12+G45+G56)≥4.000, wherein a more preferable range is 4.000≤ALT/(G12+G45+G56)≤8.000;

the optical imaging lens 10 may satisfy TL/BFL≤4.500, wherein a more preferable range is 2.900≤TL/BFL≤4.500;

the optical imaging lens 10 may satisfy TTL/(T1+G12)≤9.000, wherein a more preferable range is 4.300≤TTL/(T1+G12)≤9.000;

the optical imaging lens 10 may satisfy (G45+EFL)/(T1+T2+T3)≥1.500, wherein a more preferable range is 1.500≤(G45+EFL)/(T1+T2+T3)≤2.400;

the optical imaging lens 10 may satisfy (EFL+BFL)/(G12+G45)≤7.200, wherein a more preferable range is 3.100≤(EFL+BFL)/(G12+G45)≤7.200;

the optical imaging lens 10 may satisfy ALT/(G23+T4)≤3.400, wherein a more preferable range is 2.200≤ALT/(G23+T4)≤3.400;

the optical imaging lens 10 may satisfy TTL/(T5+G56+T6)≥5.800, wherein a more preferable range is 5.800≤TTL/(T5+G56+T6)≤10.700; and

the optical imaging lens 10 may satisfy TTL/(T2+T3+T4)≤4.100, wherein a more preferable range is 1.700≤TTL/(T2+T3+T4)≤4.100.

In addition, lens element limitations may be further added by using any combination relation of the parameters selected from the provided embodiments to implement the design for the lens elements with the same framework set forth in the embodiments of the invention. Due to the unpredictability in an optical system design, with the framework set forth in the invention, the shortened system length, the enlarged field of view, the improved imaging quality, or the improved assembly yield can be achieved for the lens element of the invention to improve the shortcomings of the related art if aforementioned conditions are satisfied.

The aforementioned limitation relational expressions are provided in an exemplary sense and can be randomly and selectively combined and applied to the embodiments of the invention in different manners; the invention should not be limited to the above examples. In implementation of the invention, apart from the above-described relations, it is also possible to add additional detailed structure such as more concave and convex curvatures arrangement of a specific lens element or a plurality of lens elements so as to enhance control of system property and/or resolution. For example, a convex surface located on the optical axis region may be selectively formed on the object-side surface of the first lens element. It should be noted that the above-described details can be optionally combined and applied to the other embodiments of the invention under the condition where they are not in conflict with one another.

To sum up, the optical imaging lens described in the embodiments of the invention may have at least one of the following advantages and/or achieve at least one of the following effects.

1. The longitudinal spherical aberrations, the astigmatic aberrations, and the distortion aberrations provided in the embodiments of the invention all comply with usage specifications. Moreover, the off-axis rays of the three representative wavelengths of red, green and blue at different heights are all focused near the imaging point, and the skew margin of the curve of each wavelength shows that the imaging point deviation of the off-axis rays at different heights is under control to provide the capability of suppressing spherical aberrations, image aberrations, and distortion. With further examination upon the imaging quality data, inter-distances between the three representative wavelengths of red, green and blue are fairly close, which represents that light rays with different wavelengths in the invention can be well focused under different circumstances to provide the capability of suppressing dispersion. In summary, the invention can achieve excellent image quality through design and mutual matching of the lenses.

2. In the optical imaging lens of the embodiment of the invention, by designing the first lens to have negative refracting power, designing the periphery region of the image-side surface of the second lens element to be convex, designing the optical axis region of the object-side surface of the third lens element to be convex, designing the optical axis region of the object-side surface of the fourth lens element to be convex, designing the optical axis region of the image-side surface of the fifth lens element to be convex, designing the periphery region of the object-side surface of the sixth lens element to be concave, designing the optical axis region of the image-side surface of the sixth lens element to be concave and making the optical imaging lens satisfy Li11t42/L42t62≥2.400 and V3+V4+V5≤120.000, the entire optical imaging lens can effectively improve the chromatic aberration of the optical system while expanding the field of view and reducing the length system of the lens elements. Here, preferred implementation ranges of Li11t42/L42t62 and V3+V4+V5 are 2.400≤L1t42/L42t62≤55.400 and 85.000≤V3+V4+V5≤120.000, respectively.

3. In the optical imaging lens of the embodiment of the invention, by designing the first lens to have negative refracting power, designing the periphery region of the object-side surface of the first lens element to be convex, designing the periphery region of the image-side surface of the third lens element to be concave, designing the optical axis region of the image-side surface of the fifth lens element to be convex, designing the periphery region of the object-side surface of the sixth lens element to be concave, designing the optical axis region of the image-side surface of the sixth lens element to be concave, designing the periphery region of the image-side surface of the sixth lens element to be convex and making the optical imaging lens satisfy Li11t42/L42t62≥2.500 and V4+V5≤80.000, while one of “(a) the optical axis region of the image-side surface of the second lens element is designed to be convex” or “(b) the third lens element is designed to have negative refracting power” is satisfied, in addition to expanding the field of view and reducing the system length of the lenses while maintaining good imaging quality, the chromatic aberration of the optical system and the field curvature aberration may be corrected and the distortion aberration may be also reduced. Here, preferred implementation ranges of Li11t42/L42t62 and V4+V5 are 2.500≤Li11t42/L42t62≤5.400 and 65.000≤V4+V5≤80.000, respectively.

4. In the optical imaging lens of the embodiment of the invention, by designing the first lens to have negative refracting power, designing the periphery region of the object-side surface of the first lens element to be convex, designing the second lens element to have positive refracting power, designing the periphery region of the image-side surface of the third lens element to be concave, designing the periphery region of the image-side surface of the fifth lens element to be convex, designing the optical axis region of the image-side surface of the sixth lens element to be concave, making the thickest and the second thickest lens elements among all the lens elements (e.g., the first lens element to the sixth lens element) of the optical imaging lens between the first lens element to the fourth lens element and making the optical imaging lens satisfy V4+V5≤80.000, while one of “(a) the periphery region of the image-side surface of the second lens element is designed to be convex; the periphery region of the object-side surface of the sixth lens element is designed to be concave; and the periphery region of the image-side surface of the sixth lens element is designed to be convex” or (b) “the optical axis region of the object-side surface of the fifth lens element is designed to be concave” is satisfied, in addition to reducing the lens length and maintaining good imaging quality, the field curvature aberration of the optical system may be corrected and the distortion aberration may also be reduced. Here, a preferred implementation range of V4+V5 is 65.000≤V4+V5≤80.000.

5. The design of the lens elements adopting the aspheric surface in each embodiment of the invention is more advantageous for optimizing image quality.

6. The plastic material selected and used by the lens elements in each embodiment of the invention contributes to light weight, and can reduce the weight and cost of the optical imaging lens.

All of the numerical ranges including the maximum and minimum values and the values therebetween which are obtained from the combining proportion relation of the optical parameters disclosed in each embodiment of the invention are implementable.

Although the present disclosure has been described with reference to the above embodiments, it will be apparent to one of ordinary skill in the art that modifications to the described embodiments may be made without departing from the spirit of the disclosure.

Accordingly, the scope of the disclosure will be defined by the attached claims and not by the above detailed descriptions. 

What is claimed is:
 1. Optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element sequentially along an optical axis from an object side to an image side, and each of the first lens element to the sixth lens element comprising an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein the first lens element has negative refracting power; the second lens element has positive refracting power and a periphery region of the image-side surface of the second lens element is convex; the third lens element has negative refracting power and an optical axis region of the object-side surface of the third lens element is convex; the fourth lens element has positive refracting power and an optical axis region of the object-side surface of the fourth lens element is convex; an optical axis region of the image-side surface of the fifth lens element is convex; and a periphery region of the object-side surface of the sixth lens element is concave and an optical axis region of the image-side surface of the sixth lens element is concave, wherein the optical imaging lens has only the six lens elements and satisfies condition expressions of: L11t42/L42t62≥2.400; V3+V4+V5≤120.000; and TL/(G12+G23+G34)≥5.100, wherein L11t42 is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, L42t62 is a distance from the image-side surface of the fourth lens element to the image-side surface of the sixth lens element along the optical axis, V3 is an Abbe number of the third lens element, V4 is an Abbe number of the fourth lens element, V5 is an Abbe number of the fifth lens element, TL is a distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element along the optical axis, G12 is an air gap from the first lens element to the second lens element along the optical axis, G23 is an air gap from the second lens element to the third lens element along the optical axis, and G34 is an air gap from the third lens element to the fourth lens element along the optical axis.
 2. Optical imaging lens of claim 1, wherein the optical imaging lens further satisfies a condition expression of: HFOV/Fno≥18.000 degrees, wherein HFOV is a half field of view of the optical imaging lens, and Fno is an f-number of the optical imaging lens.
 3. Optical imaging lens of claim 1, wherein the optical imaging lens further satisfies a condition expression of: (EFL+BFL)/ALT≥0.800, wherein EFL is an effective focal length of the optical imaging lens, BFL is a distance from the image-side surface of the sixth lens element to an image plane along the optical axis, and ALT is a sum of six lens thicknesses of the first lens element to the sixth lens element along the optical axis.
 4. Optical imaging lens of claim 1, wherein the optical imaging lens further satisfies a condition expression of: ALT/AAG≥3.000, wherein ALT is a sum of six lens thicknesses of the first lens element to the sixth lens element along the optical axis, and AAG is a sum of five air gaps of the first lens element to the sixth lens element along the optical axis.
 5. Optical imaging lens of claim 1, wherein the optical imaging lens further satisfies a condition expression of: TTL/(Tmax+Tmax2)≤3.100, wherein TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, Tmax is a thickest lens thickness of the first lens element to the sixth lens element along the optical axis, and Tmax2 is a second thickest lens thickness of the first lens element to the sixth lens element along the optical axis.
 6. Optical imaging lens of claim 1, wherein the optical imaging lens further satisfies a condition expression of: (G34+T4+G45)/BFL≥1.000, wherein T4 is a thickness of the fourth lens element along the optical axis, G45 is an air gap from the fourth lens element to the fifth lens element along the optical axis, and BFL is a distance from the image-side surface of the sixth lens element to an image plane along the optical axis.
 7. Optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element sequentially along an optical axis from an object side to an image side, and each of the first lens element to the sixth lens element comprising an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein the first lens element has negative refracting power and a periphery region of the object-side surface of the first lens element is convex; the second lens element has positive refracting power and an optical axis region of the image-side surface of the second lens element is convex; the third lens element has negative refracting power and a periphery region of the image-side surface of the third lens element is concave; the fourth lens element has positive refracting power; an optical axis region of the image-side surface of the fifth lens element is convex; and a periphery region of the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element has an optical axis region being concave and a periphery region being convex, wherein the optical imaging lens has only the six lens elements and satisfies condition expressions of: L11t42/L42t62≥2.500; V4+V5≤80.000; and (EFL+BFL)/AAG≥2.400, wherein L11t42 is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, L42t62 is a distance from the image-side surface of the fourth lens element to the image-side surface of the sixth lens element along the optical axis, V4 is an Abbe number of the fourth lens element, V5 is an Abbe number of the fifth lens element, EFL is an effective focal length of the optical imaging lens, BFL is a distance from the image-side surface of the sixth lens element to an image plane along the optical axis, and AAG is a sum of five air gaps of the first lens element to the sixth lens element along the optical axis.
 8. Optical imaging lens of claim 7, wherein the optical imaging lens further satisfies a condition expression of: HFOV/(Tmax+Tmax2)≥20.000 degrees/mm, wherein HFOV is a half field of view of the optical imaging lens, Tmax is a thickest lens thickness of the first lens element to the sixth lens element along the optical axis, and Tmax2 is a second thickest lens thickness of the first lens element to the sixth lens element along the optical axis.
 9. Optical imaging lens of claim 7, wherein the optical imaging lens further satisfies a condition expression of: ALT/(G12+G45+G56)≥4.000, wherein ALT is a sum of six lens thicknesses of the first lens element to the sixth lens element along the optical axis, G12 is an air gap from the first lens element to the second lens element along the optical axis, G45 is an air gap from the fourth lens element to the fifth lens element along the optical axis, and G56 is an air gap from the fifth lens element to the sixth lens element along the optical axis.
 10. Optical imaging lens of claim 7, wherein the optical imaging lens further satisfies a condition expression of: TL/BFL≤4.500, wherein TL is a distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element along the optical axis.
 11. Optical imaging lens of claim 7, wherein the optical imaging lens further satisfies a condition expression of: TTL/(T1+G12)≤9.000, wherein TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, T1 is a thickness of the first lens element along the optical axis, and G12 is an air gap from the first lens element to the second lens element along the optical axis.
 12. Optical imaging lens of claim 7, wherein the optical imaging lens further satisfies a condition expression of: (G45+EFL)/(T1+T2+T3)≥1.500, wherein G45 is an air gap from the fourth lens element to the fifth lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and T3 is a thickness of the third lens element along the optical axis.
 13. Optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element sequentially along an optical axis from an object side to an image side, and each of the first lens element to the sixth lens element comprising an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein the first lens element has negative refracting power and a periphery region of the object-side surface of the first lens element is convex; the second lens element has positive refracting power; the third lens element has negative refracting power and a periphery region of the image-side surface of the third lens element is concave; the fourth lens element has positive refracting power; an optical axis region of the image-side surface of the fifth lens element is convex; and a periphery region of the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element has an optical axis region being concave and a periphery region being convex, wherein the optical imaging lens has only the six lens elements and satisfies condition expressions of: L11t42/L42t62≥2.500; V4+V5≤80.000; and (EFL+BFL)/AAG≥2.400, wherein L11t42 is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, L42t62 is a distance from the image-side surface of the fourth lens element to the image-side surface of the sixth lens element along the optical axis, V4 is an Abbe number of the fourth lens element, V5 is an Abbe number of the fifth lens element, EFL is an effective focal length of the optical imaging lens, BFL is a distance from the image-side surface of the sixth lens element to an image plane along the optical axis, and AAG is a sum of five air gaps of the first lens element to the sixth lens element along the optical axis.
 14. Optical imaging lens of claim 13, wherein the optical imaging lens further satisfies a condition expression of: HFOV/TTL≥9.500 degrees/mm, wherein HFOV is a half field of view of the optical imaging lens, and TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis.
 15. Optical imaging lens of claim 13, wherein the optical imaging lens further satisfies a condition expression of: (EFL+BFL)/(G12+G45)≤7.200, wherein G12 is an air gap from the first lens element to the second lens element along the optical axis, and G45 is an air gap from the fourth lens element to the fifth lens element along the optical axis.
 16. Optical imaging lens of claim 13, wherein the optical imaging lens further satisfies a condition expression of: ALT/(G23+T4)≤3.400, wherein ALT is a sum of six lens thicknesses of the first lens element to the sixth lens element along the optical axis, G23 is an air gap from the second lens element to the third lens element along the optical axis, and T4 is a thickness of the fourth lens element along the optical axis.
 17. Optical imaging lens of claim 13, wherein the optical imaging lens further satisfies a condition expression of: TTL/(T5+G56+T6)≥5.800, wherein TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, T5 is a thickness of the fifth lens element along the optical axis, G56 is an air gap from the fifth lens element to the sixth lens element along the optical axis, and T6 is a thickness of the sixth lens element along the optical axis.
 18. Optical imaging lens of claim 13, wherein the optical imaging lens further satisfies a condition expression of: TTL/(T2+T3+T4)≤4.100, wherein TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, and T4 is a thickness of the fourth lens element along the optical axis. 